Haste Blood Build

I was thinking of trying this out and seeing how it went, I searched the forums and a few others to see if anyone had and couldn't find any results. I figured at low level content, the increased rune regen + high mastery would make survivability stay about the same, while adding a decent DPS boost. Has anyone tried this or have anything to offer?

I'm currently trying this because in my guild we are running outgeared content (495+ raid in hof/toef nhc) and the few bosses we downed in mogu hc aren't that hard. In the end haste IS worse than dodge/parry or masterybuild, hit/exp-capping is irrelevant in that case (but you should run with hit/exp caps in a haste-experiment).
In the end you get more DS per minute, but you lose a lot of mastery (I went from 10700mastery to 5000 and from 800 haste to 7000), that's a rough increase of 15% in haste but I went from ~194% masteryshields down to ~140% (raidbuffed, ofc.)
You do get more DS/min, but your DS will be weaker by a bigger margin. Also SoB stacks tend not to get as high as with masterybuilds, even though haste increases the DS/min ratio about as much as the autohit.
In the end, if you are running content that is challenging you in survival, haste is a no-go for raiding. I'm also only experimenting to compare how much worse it is, because we have great healers and slacking dps...

EDIT: If you're testing it as well, let me know how it is going. There is almost nothing on the web about haste tanking in MoP - Mostly because it ISN'T optimal. But under certain circumstances it can be viable to a certain degree (eg. overgearing)

Raided tonight with a haste oriented setup... And did quite well. Here some numbers: http://worldoflogs.com/reports/rt-88n3k0m3szuah4t7/
Basically you lose about 10-15% HpS, but I gained roughly 14k DpS per boss in Terrace (comparing to a 2 week old log, no upgrades since then). I even did more healing on Stone Guards HC than I did the last time.
Read this with a grain of salt tho: it ISN'T ideal and should only be used when you already play your char safely and have good healers having your back. Secondly, you need to have quite good gear and almost outgear your actual content (I consider ilvl495 outgearing MV hc, 10m ofc), AND I'd say this is only doable in 10m (hc), since 25m hc should crush you to death.

yea i do the same thing with farm bosses (use my frost dps gear basically) even though my frost gear ilvl is about 7 or 8 ilvl's lower than my tank gear, i do far more dps with it on (enough to rank on fights on WoL). grats on all the high ranks you got rhapso.